What is REG?
REG, short name for Registry, is used as the file extension for Registry Data files.
.REG files are text files that are used to store Windows Registry entries.
See the sample .REG file included below.

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A

File Extension: .REG

MIME Type: text/plain

File Content: Registry Data

.REG files are Registry Data files, that are used to store Windows Registry entries.
Here is a sample .REG Registry Data file, OemVer.reg: